Zhang Xueliang or Chang Hsüeh-liang (English occasionally: Peter Hsueh Liang Chang) (3 June 1901 (according to other accounts in 1898 or 1900) in Haicheng County, Fengtian province of China – 14 October 2001 in Honolulu, Hawaii, United States), nicknamed the "Young Marshal" (少帥), became the effective ruler of Manchuria and much of North China after the assassination of his father Zhang Zuolin by the Japanese on 4 June 1928. As an instigator of the Xi'an incident he spent over 50 years under house arrest, but is regarded by the People's Republic of China as a patriotic hero.
In 1930, when warlords Feng Yuxiang and Yan Xishan attempted to overthrow Chiang Kai-shek's Kuomintang government, Zhang Xueliang stepped in to support the Nanjing government against the northern warlords in exchange for control of the key railroads in Hebei Province and the customs revenues from the port city of Tianjin. Following the Mukden Incident and the Japanese invasion of Zhang's own domain of Manchuria in 1931, Zhang's armies withdrew from the front lines without significant engagements. There has been speculation that Chiang Kai-Shek wrote a letter to Zhang asking him to pull his forces back, but later Zhang stated that he himself issued the orders. Apparently Zhang was aware of how weak his forces were compared to the Japanese, and wished to preserve his position by retaining a sizeable army. Nonetheless this would still be in line with Chiang's overall strategic standings. Zhang later traveled in Europe before returning to China to take command of the Communist Suppression Campaigns first in Hebei-Henan-Anhui and later in the Northwest.
On 6 April 1936, Zhang Xueliang met with Zhou Enlai to plan the end of the Chinese Civil War. In the Xi'an incident (12 December 1936), Zhang and another general Yang Hucheng kidnapped Chiang Kai-shek and imprisoned the head of the Kuomintang government until he agreed to form a united front with the Communists against the Japanese invasion.
Chiang at the time took a non-aggressive position against Japan and considered the Communists to be a greater danger to the government of Republic of China than the Japanese, and his overall strategy was to annihilate the Communists before focusing his efforts on the Japanese. However, growing nationalist anger against Japan made this position very unpopular, leading to Zhang's action against Chiang.
After the negotiations, Chiang agreed to unite with the Communists and drive the Japanese out of China. When Chiang was released, Zhang chose to travel with him, thinking to make sure Chiang did as he said he would. However, once they were away from Zhang's loyal troops, Chiang had him put under house arrest and reintroduced him to opium, turning him into an addict again. Chiang then had him sign a confession for numerous crimes he didn't commit.
Zhang Xueliang was tried, convicted, and sentenced to ten years in prison. Chiang Kai-shek intervened and Zhang was placed under house arrest, where Chiang made sure he was kept using opium. In 1949 with the evacuation of the Republic of China from mainland China, Zhang was transferred to Taiwan where he remained under house arrest, spending his time studying Ming dynasty poetry and the Bible. Only in 1990, after the death of Chiang's son and successor, Chiang Ching-kuo, did he gain his freedom. Zhang was probably the world's longest-serving political prisoner.
After regaining his freedom, he emigrated to Honolulu, Hawaii, in 1993. There were numerous pleas for him to visit mainland China, but Zhang, claiming his political neutrality towards both the Communists and the Nationalists (Kuomintang), declined. He never set foot in mainland China again. He died of pneumonia at the age of 100 (following the Chinese way of counting, his age is often given as 101) and was buried in Hawaii.